-LRB- CNN -RRB- -- The Senate Homeland Security Committee has scheduled a public hearing on the prostitution scandal involving U.S. military and Secret Service agents in Colombia .

The hearing will take place May 23 , Sen. Joe Lieberman , the committee chairman , told CNN 's `` State of the Union . ''

Lieberman 's is one of four congressional committees looking into the incident .

Secret Service Director Mark Sullivan and Acting Inspector General Charles Edwards will testify , Lieberman said .

The committee will ask whether Sullivan is satisfied with the investigation into what occurred in Cartagena , Colombia , Lieberman said .

Secondly , Lieberman said , the committee will ask , `` Were there indications before the Colombian scandal of behavior by Secret Service agents off duty on assignment that should have been a warning that this was coming ? ''

`` And third , what are you going to do , Director Sullivan , to make sure that nothing like this ever happens again . ''

Two weeks ago , the committee sent Sullivan a list of questions to answer by Monday .

The incident , which transpired a month ago in advance of President Obama 's trip to the Summit of the Americas , was `` heartbreaking '' and `` dangerous , '' said Lieberman , an Independent from Connecticut .

It involved roughly 20 alleged prostitutes , and has so far resulted in the dismissal of nine Secret Service members .

Three other Secret Service agents were cleared of serious misconduct .

The military is investigating the alleged involvement of 12 service members .

Photos : A decade with the Secret Service

Sen. Carl Levin , D-Michigan , chairman of the Senate Armed Services Committee , has said there is no evidence the president 's security was put at risk due to the incident . He noted that the president 's schedule was not kept in the hotel rooms of any service members believed to be involved in the scandal .

Sen. John McCain , the top Republican on the Armed Services Committee , said no classified information or weapons were present at the Hotel Caribe , where the alleged incident occurred .

Rep. Peter King , chairman of the House Committee on Homeland Security , announced Sunday that he declined a request from one of the Colombian prostitutes that he meet with her .

An attorney for Dania Londono Suarez contacted the committee with the request , he said in a statement .

`` While such a meeting -- and the inevitable circus atmosphere surrounding it -- would no doubt be of great interest to the media covering this story , a meeting with her is simply not necessary at this time for the committee to conduct a serious and thorough investigation . For now , I have directed my staff to communicate with and gather information about the misconduct from the woman via her attorney . ''

Secret Service investigators have interviewed her , King said .

Londono gave a lengthy , wide-ranging interview to Colombia 's W Radio on Friday .

@highlight

New : Rep. King says he declined a meeting with one of the prostitutes

@highlight

Lieberman : The Senate Homeland Security Committee hearing will take place May 23 , Lieberman says

@highlight

The Secret Service director will testify , he says